Electric switch



Dec. 15, 1936. C. H, LARSON 2,064,477

ELECTRIC SWITCH Filed May l1. 1935 Patented Dec.. l5, 1.936

l PATENT OFFICE.

ELEc'riuc SWITCH Carl H. Larson, Elkhart, Ind., assignor to The Adlake Company, a corporation oi' Illinois Application May 1l, 1935, Serial No. 20,899

7 Claims.

This invention relates to electric switches of the kind used to control the motor that drives the compressor of a mechanical refrigerator, and the principal object is to provide a simple, ineiipensive article that can be easily installed and aci-- justed, and will endure a long period of service.

Further objects and advantages of the invention will appear as the disclosure proceeds and. the description is read in connection with the accompanying drawing, illustrating the preferred embodiments, and in which Fig. 1 is a front elevation;

Fig. 2 is a vertical Section on the line 2-2 of Fig. 1;

Fig. 3 is a plan section on the line 3 3 of Fig. 2.

Fig. i is arperspective View of a displacer for` the mercury;

Fig. 5 is a perspective view of the bracket which forms the base and support, and

Fig. 6 is a perspective view of a yoke forming part of the agnet.

But this `rawing and the specific description is used for the purpose of disclosure only, and are not intended to impose limitations on the claims.

The mercury tube switch includes the glass tube or envelope I0 sealed o at the top,`forming a sort of conical tip II and pinch sealed at the bottom forming a flattened projection I2. Conductors I3 and I Q are sealed through the bottom and Il extends well up into the tube where it is bent over and doubled back on itself to form an electrode I5 for contact with the mercury I 6.

The displacer is a hollow cylinder I'I of glass, lava, Alundum, or the like, around which is an armature Iii-made of Some ferrous material. The

cylinder I'I is provided with ribs or flanges I9 to prevent accidental displacement of the armature,

although as a rule the clamping friction is suiicient for that purpose.` When the cylinder` is of glass these flanges can be easily formed by fusing the end portions 'and pressing the molten material. When it is made of lava, Alundum, or the like, the flanges will be formed in the molding operation.

The armature has `fingers 2U at each end bent outwardly to form guides for contact with the inner surface of the tube I8. Their tips ZI are ened and will have sufficient resilience to gripy the cylinder I1 While the fingers 20 will be hard the switch, and means to enough'tc endure a long period of service. Carbon steel can also be used.

As Shown in Fig. 4, the amature has a vertical slit 22 to prevent eddy currents when the switch is used with alternating current. 5

The opposite ends of. the tube III are received by the forked arms 23 and 24 of va bracket 25,

- yoke 29. A flange 2B on the yokev 29 has holes 21 for screws, or bolts, to secure the device in place. y

In assembling this device the coil 28 is inserted between the arms of the yoke and the mercury tube switch passed through those arms and the coil.

The ends of the mercury tube are brought between the forked arms 23 and 24, the head of the screw 33 is passed through the large portion 35 of the keyhole slot 34, the yoke and core are slipped downwardly to the correct position with. respect to the armature I8, andl the screw is set up.

At the time of installation, or whenever the position of the parts has been disturbed, the magnet can be easily adjusted by loosening the screw 33, and slipping the yoke up or down, as the case may be, and tightening the screw.

I claim as my invention: i

l. In a device of the class described, a coil, an iron yoke having aligned openings in its arms, a mercury tube switch in the coil and projecting through the openings, a bracket having arms engaging the ends of the switch and means for se- 2. In a device of the class described, a bracket having upper and lower arms, a mercury tube switch between the arms and resting on the lower one, a coil encircling the switch, a yokehaving open pole arms spanning the coi-l land receiving fasten the yoke to the bracket. 50

3. In a device of the class described, a bracket having upper and lower forked arrns, a mercury tube switch received at its ends between the forks of the respective arms, a coil surrounding the switch, a yoke spanning the coil and grasping the 55 swit and means to fasten/the yoke to the bravenet.

'In e device of the class described, c bracket 'having cn erm, a mercury tube switch standing ii on the arm of the bracket and including an armature, a coil surrounding the switch, an iron yoke spanning the ccii and grasping the switch, means to secure the yoke tc the bracket in en sdusted pcsiticri.

En e device oi' the class described, a bracket herring: an crm,- s, mercury tube switch standing on the cran of the bracket and including an armaunding the switch, an iron yoke and grasping the switch, and ie Joke te the br :het wh goe-sys?? 'having an arm, a mercury tube switch standing on the i arm of the bracket and including an armature, a coil surrounding the switch, an iron yoke spanning the coil and grasping the switch, a headed screw on the yoke and keyhole slot in the bracket to receive the screw.

'i'. In a device of the class described, a. bracket having an arm with a hole through it, e. mercury switch including a tube pinch-seaied at the bottom to form a, reduced end received in the hole of lthe bracket arm, e. conductor` sealed through the reduced end, a coi surrounding the switch, ec iron yoke associated withv the coil and grasping the switch, and means to fasten yoke tc the cracket,

Fun 

